ISO 456:1973 Preview
Surface active agents -- Analysis of soaps -- Determination of free caustic alkali
This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
The determination may be carried out in two different ways by the ethanol method or the barium chloride method. In the first case the soap is dissolved in neutralized ethanol, and the free caustic alkali is titrated with an ewthanol solution of hydrochloric acid. The second way includes precipitating of soap and carbonate with barium chloride and determining of the residual alkalinity of the solution, representing the alkalinity of the free potassium hydroxide.
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